Add m-esr52 at 52.6.0

1 files changed, 2417 insertions, 0 deletions

diff --git a/devtools/client/framework/toolbox.js b/devtools/client/framework/toolbox.js
new file mode 100644
index 000000000..82d5d2915
--- /dev/null
+++ b/devtools/client/framework/toolbox.js
@@ -0,0 +1,2417 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const MAX_ORDINAL = 99;
+const SPLITCONSOLE_ENABLED_PREF = "devtools.toolbox.splitconsoleEnabled";
+const SPLITCONSOLE_HEIGHT_PREF = "devtools.toolbox.splitconsoleHeight";
+const OS_HISTOGRAM = "DEVTOOLS_OS_ENUMERATED_PER_USER";
+const OS_IS_64_BITS = "DEVTOOLS_OS_IS_64_BITS_PER_USER";
+const HOST_HISTOGRAM = "DEVTOOLS_TOOLBOX_HOST";
+const SCREENSIZE_HISTOGRAM = "DEVTOOLS_SCREEN_RESOLUTION_ENUMERATED_PER_USER";
+const HTML_NS = "http://www.w3.org/1999/xhtml";
+const { SourceMapService } = require("./source-map-service");
+
+var {Ci, Cu} = require("chrome");
+var promise = require("promise");
+var defer = require("devtools/shared/defer");
+var Services = require("Services");
+var {Task} = require("devtools/shared/task");
+var {gDevTools} = require("devtools/client/framework/devtools");
+var EventEmitter = require("devtools/shared/event-emitter");
+var Telemetry = require("devtools/client/shared/telemetry");
+var HUDService = require("devtools/client/webconsole/hudservice");
+var viewSource = require("devtools/client/shared/view-source");
+var { attachThread, detachThread } = require("./attach-thread");
+var Menu = require("devtools/client/framework/menu");
+var MenuItem = require("devtools/client/framework/menu-item");
+var { DOMHelpers } = require("resource://devtools/client/shared/DOMHelpers.jsm");
+const { KeyCodes } = require("devtools/client/shared/keycodes");
+
+const { BrowserLoader } =
+  Cu.import("resource://devtools/client/shared/browser-loader.js", {});
+
+const {LocalizationHelper} = require("devtools/shared/l10n");
+const L10N = new LocalizationHelper("devtools/client/locales/toolbox.properties");
+
+loader.lazyRequireGetter(this, "CommandUtils",
+  "devtools/client/shared/developer-toolbar", true);
+loader.lazyRequireGetter(this, "getHighlighterUtils",
+  "devtools/client/framework/toolbox-highlighter-utils", true);
+loader.lazyRequireGetter(this, "Selection",
+  "devtools/client/framework/selection", true);
+loader.lazyRequireGetter(this, "InspectorFront",
+  "devtools/shared/fronts/inspector", true);
+loader.lazyRequireGetter(this, "flags",
+  "devtools/shared/flags");
+loader.lazyRequireGetter(this, "showDoorhanger",
+  "devtools/client/shared/doorhanger", true);
+loader.lazyRequireGetter(this, "createPerformanceFront",
+  "devtools/shared/fronts/performance", true);
+loader.lazyRequireGetter(this, "system",
+  "devtools/shared/system");
+loader.lazyRequireGetter(this, "getPreferenceFront",
+  "devtools/shared/fronts/preference", true);
+loader.lazyRequireGetter(this, "KeyShortcuts",
+  "devtools/client/shared/key-shortcuts", true);
+loader.lazyRequireGetter(this, "ZoomKeys",
+  "devtools/client/shared/zoom-keys");
+loader.lazyRequireGetter(this, "settleAll",
+  "devtools/shared/ThreadSafeDevToolsUtils", true);
+loader.lazyRequireGetter(this, "ToolboxButtons",
+  "devtools/client/definitions", true);
+
+loader.lazyGetter(this, "registerHarOverlay", () => {
+  return require("devtools/client/netmonitor/har/toolbox-overlay").register;
+});
+
+/**
+ * A "Toolbox" is the component that holds all the tools for one specific
+ * target. Visually, it's a document that includes the tools tabs and all
+ * the iframes where the tool panels will be living in.
+ *
+ * @param {object} target
+ *        The object the toolbox is debugging.
+ * @param {string} selectedTool
+ *        Tool to select initially
+ * @param {Toolbox.HostType} hostType
+ *        Type of host that will host the toolbox (e.g. sidebar, window)
+ * @param {DOMWindow} contentWindow
+ *        The window object of the toolbox document
+ * @param {string} frameId
+ *        A unique identifier to differentiate toolbox documents from the
+ *        chrome codebase when passing DOM messages
+ */
+function Toolbox(target, selectedTool, hostType, contentWindow, frameId) {
+  this._target = target;
+  this._win = contentWindow;
+  this.frameId = frameId;
+
+  this._toolPanels = new Map();
+  this._telemetry = new Telemetry();
+  if (Services.prefs.getBoolPref("devtools.sourcemap.locations.enabled")) {
+    this._sourceMapService = new SourceMapService(this._target);
+  }
+
+  this._initInspector = null;
+  this._inspector = null;
+
+  // Map of frames (id => frame-info) and currently selected frame id.
+  this.frameMap = new Map();
+  this.selectedFrameId = null;
+
+  this._toolRegistered = this._toolRegistered.bind(this);
+  this._toolUnregistered = this._toolUnregistered.bind(this);
+  this._refreshHostTitle = this._refreshHostTitle.bind(this);
+  this._toggleAutohide = this._toggleAutohide.bind(this);
+  this.showFramesMenu = this.showFramesMenu.bind(this);
+  this._updateFrames = this._updateFrames.bind(this);
+  this._splitConsoleOnKeypress = this._splitConsoleOnKeypress.bind(this);
+  this.destroy = this.destroy.bind(this);
+  this.highlighterUtils = getHighlighterUtils(this);
+  this._highlighterReady = this._highlighterReady.bind(this);
+  this._highlighterHidden = this._highlighterHidden.bind(this);
+  this._prefChanged = this._prefChanged.bind(this);
+  this._saveSplitConsoleHeight = this._saveSplitConsoleHeight.bind(this);
+  this._onFocus = this._onFocus.bind(this);
+  this._onBrowserMessage = this._onBrowserMessage.bind(this);
+  this._showDevEditionPromo = this._showDevEditionPromo.bind(this);
+  this._updateTextBoxMenuItems = this._updateTextBoxMenuItems.bind(this);
+  this._onBottomHostMinimized = this._onBottomHostMinimized.bind(this);
+  this._onBottomHostMaximized = this._onBottomHostMaximized.bind(this);
+  this._onToolSelectWhileMinimized = this._onToolSelectWhileMinimized.bind(this);
+  this._onPerformanceFrontEvent = this._onPerformanceFrontEvent.bind(this);
+  this._onBottomHostWillChange = this._onBottomHostWillChange.bind(this);
+  this._toggleMinimizeMode = this._toggleMinimizeMode.bind(this);
+  this._onTabbarFocus = this._onTabbarFocus.bind(this);
+  this._onTabbarArrowKeypress = this._onTabbarArrowKeypress.bind(this);
+  this._onPickerClick = this._onPickerClick.bind(this);
+  this._onPickerKeypress = this._onPickerKeypress.bind(this);
+  this._onPickerStarted = this._onPickerStarted.bind(this);
+  this._onPickerStopped = this._onPickerStopped.bind(this);
+
+  this._target.on("close", this.destroy);
+
+  if (!selectedTool) {
+    selectedTool = Services.prefs.getCharPref(this._prefs.LAST_TOOL);
+  }
+  this._defaultToolId = selectedTool;
+
+  this._hostType = hostType;
+
+  EventEmitter.decorate(this);
+
+  this._target.on("navigate", this._refreshHostTitle);
+  this._target.on("frame-update", this._updateFrames);
+
+  this.on("host-changed", this._refreshHostTitle);
+  this.on("select", this._refreshHostTitle);
+
+  this.on("ready", this._showDevEditionPromo);
+
+  gDevTools.on("tool-registered", this._toolRegistered);
+  gDevTools.on("tool-unregistered", this._toolUnregistered);
+
+  this.on("picker-started", this._onPickerStarted);
+  this.on("picker-stopped", this._onPickerStopped);
+}
+exports.Toolbox = Toolbox;
+
+/**
+ * The toolbox can be 'hosted' either embedded in a browser window
+ * or in a separate window.
+ */
+Toolbox.HostType = {
+  BOTTOM: "bottom",
+  SIDE: "side",
+  WINDOW: "window",
+  CUSTOM: "custom"
+};
+
+Toolbox.prototype = {
+  _URL: "about:devtools-toolbox",
+
+  _prefs: {
+    LAST_TOOL: "devtools.toolbox.selectedTool",
+    SIDE_ENABLED: "devtools.toolbox.sideEnabled",
+  },
+
+  currentToolId: null,
+  lastUsedToolId: null,
+
+  /**
+   * Returns a *copy* of the _toolPanels collection.
+   *
+   * @return {Map} panels
+   *         All the running panels in the toolbox
+   */
+  getToolPanels: function () {
+    return new Map(this._toolPanels);
+  },
+
+  /**
+   * Access the panel for a given tool
+   */
+  getPanel: function (id) {
+    return this._toolPanels.get(id);
+  },
+
+  /**
+   * Get the panel instance for a given tool once it is ready.
+   * If the tool is already opened, the promise will resolve immediately,
+   * otherwise it will wait until the tool has been opened before resolving.
+   *
+   * Note that this does not open the tool, use selectTool if you'd
+   * like to select the tool right away.
+   *
+   * @param  {String} id
+   *         The id of the panel, for example "jsdebugger".
+   * @returns Promise
+   *          A promise that resolves once the panel is ready.
+   */
+  getPanelWhenReady: function (id) {
+    let deferred = defer();
+    let panel = this.getPanel(id);
+    if (panel) {
+      deferred.resolve(panel);
+    } else {
+      this.on(id + "-ready", (e, initializedPanel) => {
+        deferred.resolve(initializedPanel);
+      });
+    }
+
+    return deferred.promise;
+  },
+
+  /**
+   * This is a shortcut for getPanel(currentToolId) because it is much more
+   * likely that we're going to want to get the panel that we've just made
+   * visible
+   */
+  getCurrentPanel: function () {
+    return this._toolPanels.get(this.currentToolId);
+  },
+
+  /**
+   * Get/alter the target of a Toolbox so we're debugging something different.
+   * See Target.jsm for more details.
+   * TODO: Do we allow |toolbox.target = null;| ?
+   */
+  get target() {
+    return this._target;
+  },
+
+  get threadClient() {
+    return this._threadClient;
+  },
+
+  /**
+   * Get/alter the host of a Toolbox, i.e. is it in browser or in a separate
+   * tab. See HostType for more details.
+   */
+  get hostType() {
+    return this._hostType;
+  },
+
+  /**
+   * Shortcut to the window containing the toolbox UI
+   */
+  get win() {
+    return this._win;
+  },
+
+  /**
+   * Shortcut to the document containing the toolbox UI
+   */
+  get doc() {
+    return this.win.document;
+  },
+
+  /**
+   * Get the toolbox highlighter front. Note that it may not always have been
+   * initialized first. Use `initInspector()` if needed.
+   * Consider using highlighterUtils instead, it exposes the highlighter API in
+   * a useful way for the toolbox panels
+   */
+  get highlighter() {
+    return this._highlighter;
+  },
+
+  /**
+   * Get the toolbox's performance front. Note that it may not always have been
+   * initialized first. Use `initPerformance()` if needed.
+   */
+  get performance() {
+    return this._performance;
+  },
+
+  /**
+   * Get the toolbox's inspector front. Note that it may not always have been
+   * initialized first. Use `initInspector()` if needed.
+   */
+  get inspector() {
+    return this._inspector;
+  },
+
+  /**
+   * Get the toolbox's walker front. Note that it may not always have been
+   * initialized first. Use `initInspector()` if needed.
+   */
+  get walker() {
+    return this._walker;
+  },
+
+  /**
+   * Get the toolbox's node selection. Note that it may not always have been
+   * initialized first. Use `initInspector()` if needed.
+   */
+  get selection() {
+    return this._selection;
+  },
+
+  /**
+   * Get the toggled state of the split console
+   */
+  get splitConsole() {
+    return this._splitConsole;
+  },
+
+  /**
+   * Get the focused state of the split console
+   */
+  isSplitConsoleFocused: function () {
+    if (!this._splitConsole) {
+      return false;
+    }
+    let focusedWin = Services.focus.focusedWindow;
+    return focusedWin && focusedWin ===
+      this.doc.querySelector("#toolbox-panel-iframe-webconsole").contentWindow;
+  },
+
+  /**
+   * Open the toolbox
+   */
+  open: function () {
+    return Task.spawn(function* () {
+      this.browserRequire = BrowserLoader({
+        window: this.doc.defaultView,
+        useOnlyShared: true
+      }).require;
+
+      if (this.win.location.href.startsWith(this._URL)) {
+        // Update the URL so that onceDOMReady watch for the right url.
+        this._URL = this.win.location.href;
+      }
+
+      let domReady = defer();
+      let domHelper = new DOMHelpers(this.win);
+      domHelper.onceDOMReady(() => {
+        domReady.resolve();
+      }, this._URL);
+
+      // Optimization: fire up a few other things before waiting on
+      // the iframe being ready (makes startup faster)
+
+      // Load the toolbox-level actor fronts and utilities now
+      yield this._target.makeRemote();
+
+      // Attach the thread
+      this._threadClient = yield attachThread(this);
+      yield domReady.promise;
+
+      this.isReady = true;
+      let framesPromise = this._listFrames();
+
+      this.closeButton = this.doc.getElementById("toolbox-close");
+      this.closeButton.addEventListener("click", this.destroy, true);
+
+      gDevTools.on("pref-changed", this._prefChanged);
+
+      let framesMenu = this.doc.getElementById("command-button-frames");
+      framesMenu.addEventListener("click", this.showFramesMenu, false);
+
+      let noautohideMenu = this.doc.getElementById("command-button-noautohide");
+      noautohideMenu.addEventListener("click", this._toggleAutohide, true);
+
+      this.textBoxContextMenuPopup =
+        this.doc.getElementById("toolbox-textbox-context-popup");
+      this.textBoxContextMenuPopup.addEventListener("popupshowing",
+        this._updateTextBoxMenuItems, true);
+
+      this.shortcuts = new KeyShortcuts({
+        window: this.doc.defaultView
+      });
+      this._buildDockButtons();
+      this._buildOptions();
+      this._buildTabs();
+      this._applyCacheSettings();
+      this._applyServiceWorkersTestingSettings();
+      this._addKeysToWindow();
+      this._addReloadKeys();
+      this._addHostListeners();
+      this._registerOverlays();
+      if (!this._hostOptions || this._hostOptions.zoom === true) {
+        ZoomKeys.register(this.win);
+      }
+
+      this.tabbar = this.doc.querySelector(".devtools-tabbar");
+      this.tabbar.addEventListener("focus", this._onTabbarFocus, true);
+      this.tabbar.addEventListener("click", this._onTabbarFocus, true);
+      this.tabbar.addEventListener("keypress", this._onTabbarArrowKeypress);
+
+      this.webconsolePanel = this.doc.querySelector("#toolbox-panel-webconsole");
+      this.webconsolePanel.height = Services.prefs.getIntPref(SPLITCONSOLE_HEIGHT_PREF);
+      this.webconsolePanel.addEventListener("resize", this._saveSplitConsoleHeight);
+
+      let buttonsPromise = this._buildButtons();
+
+      this._pingTelemetry();
+
+      // The isTargetSupported check needs to happen after the target is
+      // remoted, otherwise we could have done it in the toolbox constructor
+      // (bug 1072764).
+      let toolDef = gDevTools.getToolDefinition(this._defaultToolId);
+      if (!toolDef || !toolDef.isTargetSupported(this._target)) {
+        this._defaultToolId = "webconsole";
+      }
+
+      yield this.selectTool(this._defaultToolId);
+
+      // Wait until the original tool is selected so that the split
+      // console input will receive focus.
+      let splitConsolePromise = promise.resolve();
+      if (Services.prefs.getBoolPref(SPLITCONSOLE_ENABLED_PREF)) {
+        splitConsolePromise = this.openSplitConsole();
+      }
+
+      yield promise.all([
+        splitConsolePromise,
+        buttonsPromise,
+        framesPromise
+      ]);
+
+      // Lazily connect to the profiler here and don't wait for it to complete,
+      // used to intercept console.profile calls before the performance tools are open.
+      let performanceFrontConnection = this.initPerformance();
+
+      // If in testing environment, wait for performance connection to finish,
+      // so we don't have to explicitly wait for this in tests; ideally, all tests
+      // will handle this on their own, but each have their own tear down function.
+      if (flags.testing) {
+        yield performanceFrontConnection;
+      }
+
+      this.emit("ready");
+    }.bind(this)).then(null, console.error.bind(console));
+  },
+
+  /**
+   * loading React modules when needed (to avoid performance penalties
+   * during Firefox start up time).
+   */
+  get React() {
+    return this.browserRequire("devtools/client/shared/vendor/react");
+  },
+
+  get ReactDOM() {
+    return this.browserRequire("devtools/client/shared/vendor/react-dom");
+  },
+
+  get ReactRedux() {
+    return this.browserRequire("devtools/client/shared/vendor/react-redux");
+  },
+
+  // Return HostType id for telemetry
+  _getTelemetryHostId: function () {
+    switch (this.hostType) {
+      case Toolbox.HostType.BOTTOM: return 0;
+      case Toolbox.HostType.SIDE: return 1;
+      case Toolbox.HostType.WINDOW: return 2;
+      case Toolbox.HostType.CUSTOM: return 3;
+      default: return 9;
+    }
+  },
+
+  _pingTelemetry: function () {
+    this._telemetry.toolOpened("toolbox");
+
+    this._telemetry.logOncePerBrowserVersion(OS_HISTOGRAM, system.getOSCPU());
+    this._telemetry.logOncePerBrowserVersion(OS_IS_64_BITS,
+                                             Services.appinfo.is64Bit ? 1 : 0);
+    this._telemetry.logOncePerBrowserVersion(SCREENSIZE_HISTOGRAM,
+                                             system.getScreenDimensions());
+    this._telemetry.log(HOST_HISTOGRAM, this._getTelemetryHostId());
+  },
+
+  /**
+   * Because our panels are lazy loaded this is a good place to watch for
+   * "pref-changed" events.
+   * @param  {String} event
+   *         The event type, "pref-changed".
+   * @param  {Object} data
+   *         {
+   *           newValue: The new value
+   *           oldValue:  The old value
+   *           pref: The name of the preference that has changed
+   *         }
+   */
+  _prefChanged: function (event, data) {
+    switch (data.pref) {
+      case "devtools.cache.disabled":
+        this._applyCacheSettings();
+        break;
+      case "devtools.serviceWorkers.testing.enabled":
+        this._applyServiceWorkersTestingSettings();
+        break;
+    }
+  },
+
+  _buildOptions: function () {
+    let selectOptions = (name, event) => {
+      // Flip back to the last used panel if we are already
+      // on the options panel.
+      if (this.currentToolId === "options" &&
+          gDevTools.getToolDefinition(this.lastUsedToolId)) {
+        this.selectTool(this.lastUsedToolId);
+      } else {
+        this.selectTool("options");
+      }
+      // Prevent the opening of bookmarks window on toolbox.options.key
+      event.preventDefault();
+    };
+    this.shortcuts.on(L10N.getStr("toolbox.options.key"), selectOptions);
+    this.shortcuts.on(L10N.getStr("toolbox.help.key"), selectOptions);
+  },
+
+  _splitConsoleOnKeypress: function (e) {
+    if (e.keyCode === KeyCodes.DOM_VK_ESCAPE) {
+      this.toggleSplitConsole();
+      // If the debugger is paused, don't let the ESC key stop any pending
+      // navigation.
+      if (this._threadClient.state == "paused") {
+        e.preventDefault();
+      }
+    }
+  },
+
+  /**
+   * Add a shortcut key that should work when a split console
+   * has focus to the toolbox.
+   *
+   * @param {String} key
+   *        The electron key shortcut.
+   * @param {Function} handler
+   *        The callback that should be called when the provided key shortcut is pressed.
+   * @param {String} whichTool
+   *        The tool the key belongs to. The corresponding handler will only be triggered
+   *        if this tool is active.
+   */
+  useKeyWithSplitConsole: function (key, handler, whichTool) {
+    this.shortcuts.on(key, (name, event) => {
+      if (this.currentToolId === whichTool && this.isSplitConsoleFocused()) {
+        handler();
+        event.preventDefault();
+      }
+    });
+  },
+
+  _addReloadKeys: function () {
+    [
+      ["reload", false],
+      ["reload2", false],
+      ["forceReload", true],
+      ["forceReload2", true]
+    ].forEach(([id, force]) => {
+      let key = L10N.getStr("toolbox." + id + ".key");
+      this.shortcuts.on(key, (name, event) => {
+        this.reloadTarget(force);
+
+        // Prevent Firefox shortcuts from reloading the page
+        event.preventDefault();
+      });
+    });
+  },
+
+  _addHostListeners: function () {
+    this.shortcuts.on(L10N.getStr("toolbox.nextTool.key"),
+                 (name, event) => {
+                   this.selectNextTool();
+                   event.preventDefault();
+                 });
+    this.shortcuts.on(L10N.getStr("toolbox.previousTool.key"),
+                 (name, event) => {
+                   this.selectPreviousTool();
+                   event.preventDefault();
+                 });
+    this.shortcuts.on(L10N.getStr("toolbox.minimize.key"),
+                 (name, event) => {
+                   this._toggleMinimizeMode();
+                   event.preventDefault();
+                 });
+    this.shortcuts.on(L10N.getStr("toolbox.toggleHost.key"),
+                 (name, event) => {
+                   this.switchToPreviousHost();
+                   event.preventDefault();
+                 });
+
+    this.doc.addEventListener("keypress", this._splitConsoleOnKeypress, false);
+    this.doc.addEventListener("focus", this._onFocus, true);
+    this.win.addEventListener("unload", this.destroy);
+    this.win.addEventListener("message", this._onBrowserMessage, true);
+  },
+
+  _removeHostListeners: function () {
+    // The host iframe's contentDocument may already be gone.
+    if (this.doc) {
+      this.doc.removeEventListener("keypress", this._splitConsoleOnKeypress, false);
+      this.doc.removeEventListener("focus", this._onFocus, true);
+      this.win.removeEventListener("unload", this.destroy);
+      this.win.removeEventListener("message", this._onBrowserMessage, true);
+    }
+  },
+
+  // Called whenever the chrome send a message
+  _onBrowserMessage: function (event) {
+    if (!event.data) {
+      return;
+    }
+    switch (event.data.name) {
+      case "switched-host":
+        this._onSwitchedHost(event.data);
+        break;
+      case "host-minimized":
+        if (this.hostType == Toolbox.HostType.BOTTOM) {
+          this._onBottomHostMinimized();
+        }
+        break;
+      case "host-maximized":
+        if (this.hostType == Toolbox.HostType.BOTTOM) {
+          this._onBottomHostMaximized();
+        }
+        break;
+    }
+  },
+
+  _registerOverlays: function () {
+    registerHarOverlay(this);
+  },
+
+  _saveSplitConsoleHeight: function () {
+    Services.prefs.setIntPref(SPLITCONSOLE_HEIGHT_PREF,
+      this.webconsolePanel.height);
+  },
+
+  /**
+   * Make sure that the console is showing up properly based on all the
+   * possible conditions.
+   *   1) If the console tab is selected, then regardless of split state
+   *      it should take up the full height of the deck, and we should
+   *      hide the deck and splitter.
+   *   2) If the console tab is not selected and it is split, then we should
+   *      show the splitter, deck, and console.
+   *   3) If the console tab is not selected and it is *not* split,
+   *      then we should hide the console and splitter, and show the deck
+   *      at full height.
+   */
+  _refreshConsoleDisplay: function () {
+    let deck = this.doc.getElementById("toolbox-deck");
+    let webconsolePanel = this.webconsolePanel;
+    let splitter = this.doc.getElementById("toolbox-console-splitter");
+    let openedConsolePanel = this.currentToolId === "webconsole";
+
+    if (openedConsolePanel) {
+      deck.setAttribute("collapsed", "true");
+      splitter.setAttribute("hidden", "true");
+      webconsolePanel.removeAttribute("collapsed");
+    } else {
+      deck.removeAttribute("collapsed");
+      if (this.splitConsole) {
+        webconsolePanel.removeAttribute("collapsed");
+        splitter.removeAttribute("hidden");
+      } else {
+        webconsolePanel.setAttribute("collapsed", "true");
+        splitter.setAttribute("hidden", "true");
+      }
+    }
+  },
+
+  /**
+   * Adds the keys and commands to the Toolbox Window in window mode.
+   */
+  _addKeysToWindow: function () {
+    if (this.hostType != Toolbox.HostType.WINDOW) {
+      return;
+    }
+
+    let doc = this.win.parent.document;
+
+    for (let [id, toolDefinition] of gDevTools.getToolDefinitionMap()) {
+      // Prevent multiple entries for the same tool.
+      if (!toolDefinition.key || doc.getElementById("key_" + id)) {
+        continue;
+      }
+
+      let toolId = id;
+      let key = doc.createElement("key");
+
+      key.id = "key_" + toolId;
+
+      if (toolDefinition.key.startsWith("VK_")) {
+        key.setAttribute("keycode", toolDefinition.key);
+      } else {
+        key.setAttribute("key", toolDefinition.key);
+      }
+
+      key.setAttribute("modifiers", toolDefinition.modifiers);
+      // needed. See bug 371900
+      key.setAttribute("oncommand", "void(0);");
+      key.addEventListener("command", () => {
+        this.selectTool(toolId).then(() => this.fireCustomKey(toolId));
+      }, true);
+      doc.getElementById("toolbox-keyset").appendChild(key);
+    }
+
+    // Add key for toggling the browser console from the detached window
+    if (!doc.getElementById("key_browserconsole")) {
+      let key = doc.createElement("key");
+      key.id = "key_browserconsole";
+
+      key.setAttribute("key", L10N.getStr("browserConsoleCmd.commandkey"));
+      key.setAttribute("modifiers", "accel,shift");
+      // needed. See bug 371900
+      key.setAttribute("oncommand", "void(0)");
+      key.addEventListener("command", () => {
+        HUDService.toggleBrowserConsole();
+      }, true);
+      doc.getElementById("toolbox-keyset").appendChild(key);
+    }
+  },
+
+  /**
+   * Handle any custom key events.  Returns true if there was a custom key
+   * binding run.
+   * @param {string} toolId Which tool to run the command on (skip if not
+   * current)
+   */
+  fireCustomKey: function (toolId) {
+    let toolDefinition = gDevTools.getToolDefinition(toolId);
+
+    if (toolDefinition.onkey &&
+        ((this.currentToolId === toolId) ||
+          (toolId == "webconsole" && this.splitConsole))) {
+      toolDefinition.onkey(this.getCurrentPanel(), this);
+    }
+  },
+
+  /**
+   * Build the notification box as soon as needed.
+   */
+  get notificationBox() {
+    if (!this._notificationBox) {
+      let { NotificationBox, PriorityLevels } =
+        this.browserRequire(
+          "devtools/client/shared/components/notification-box");
+
+      NotificationBox = this.React.createFactory(NotificationBox);
+
+      // Render NotificationBox and assign priority levels to it.
+      let box = this.doc.getElementById("toolbox-notificationbox");
+      this._notificationBox = Object.assign(
+        this.ReactDOM.render(NotificationBox({}), box),
+        PriorityLevels);
+    }
+    return this._notificationBox;
+  },
+
+  /**
+   * Build the buttons for changing hosts. Called every time
+   * the host changes.
+   */
+  _buildDockButtons: function () {
+    let dockBox = this.doc.getElementById("toolbox-dock-buttons");
+
+    while (dockBox.firstChild) {
+      dockBox.removeChild(dockBox.firstChild);
+    }
+
+    if (!this._target.isLocalTab) {
+      return;
+    }
+
+    // Bottom-type host can be minimized, add a button for this.
+    if (this.hostType == Toolbox.HostType.BOTTOM) {
+      let minimizeBtn = this.doc.createElementNS(HTML_NS, "button");
+      minimizeBtn.id = "toolbox-dock-bottom-minimize";
+      minimizeBtn.className = "devtools-button";
+      /* Bug 1177463 - The minimize button is currently hidden until we agree on
+         the UI for it, and until bug 1173849 is fixed too. */
+      minimizeBtn.setAttribute("hidden", "true");
+
+      minimizeBtn.addEventListener("click", this._toggleMinimizeMode);
+      dockBox.appendChild(minimizeBtn);
+      // Show the button in its maximized state.
+      this._onBottomHostMaximized();
+
+      // Maximize again when a tool gets selected.
+      this.on("before-select", this._onToolSelectWhileMinimized);
+      // Maximize and stop listening before the host type changes.
+      this.once("host-will-change", this._onBottomHostWillChange);
+    }
+
+    if (this.hostType == Toolbox.HostType.WINDOW) {
+      this.closeButton.setAttribute("hidden", "true");
+    } else {
+      this.closeButton.removeAttribute("hidden");
+    }
+
+    let sideEnabled = Services.prefs.getBoolPref(this._prefs.SIDE_ENABLED);
+
+    for (let type in Toolbox.HostType) {
+      let position = Toolbox.HostType[type];
+      if (position == this.hostType ||
+          position == Toolbox.HostType.CUSTOM ||
+          (!sideEnabled && position == Toolbox.HostType.SIDE)) {
+        continue;
+      }
+
+      let button = this.doc.createElementNS(HTML_NS, "button");
+      button.id = "toolbox-dock-" + position;
+      button.className = "toolbox-dock-button devtools-button";
+      button.setAttribute("title", L10N.getStr("toolboxDockButtons." +
+                                                  position + ".tooltip"));
+      button.addEventListener("click", this.switchHost.bind(this, position));
+
+      dockBox.appendChild(button);
+    }
+  },
+
+  _getMinimizeButtonShortcutTooltip: function () {
+    let str = L10N.getStr("toolbox.minimize.key");
+    let key = KeyShortcuts.parseElectronKey(this.win, str);
+    return "(" + KeyShortcuts.stringify(key) + ")";
+  },
+
+  _onBottomHostMinimized: function () {
+    let btn = this.doc.querySelector("#toolbox-dock-bottom-minimize");
+    btn.className = "minimized";
+
+    btn.setAttribute("title",
+      L10N.getStr("toolboxDockButtons.bottom.maximize") + " " +
+      this._getMinimizeButtonShortcutTooltip());
+  },
+
+  _onBottomHostMaximized: function () {
+    let btn = this.doc.querySelector("#toolbox-dock-bottom-minimize");
+    btn.className = "maximized";
+
+    btn.setAttribute("title",
+      L10N.getStr("toolboxDockButtons.bottom.minimize") + " " +
+      this._getMinimizeButtonShortcutTooltip());
+  },
+
+  _onToolSelectWhileMinimized: function () {
+    this.postMessage({
+      name: "maximize-host"
+    });
+  },
+
+  postMessage: function (msg) {
+    // We sometime try to send messages in middle of destroy(), where the
+    // toolbox iframe may already be detached and no longer have a parent.
+    if (this.win.parent) {
+      // Toolbox document is still chrome and disallow identifying message
+      // origin via event.source as it is null. So use a custom id.
+      msg.frameId = this.frameId;
+      this.win.parent.postMessage(msg, "*");
+    }
+  },
+
+  _onBottomHostWillChange: function () {
+    this.postMessage({
+      name: "maximize-host"
+    });
+
+    this.off("before-select", this._onToolSelectWhileMinimized);
+  },
+
+  _toggleMinimizeMode: function () {
+    if (this.hostType !== Toolbox.HostType.BOTTOM) {
+      return;
+    }
+
+    // Calculate the height to which the host should be minimized so the
+    // tabbar is still visible.
+    let toolbarHeight = this.tabbar.getBoxQuads({box: "content"})[0].bounds
+                                                                    .height;
+    this.postMessage({
+      name: "toggle-minimize-mode",
+      toolbarHeight
+    });
+  },
+
+  /**
+   * Add tabs to the toolbox UI for registered tools
+   */
+  _buildTabs: function () {
+    for (let definition of gDevTools.getToolDefinitionArray()) {
+      this._buildTabForTool(definition);
+    }
+  },
+
+  /**
+   * Get all dev tools tab bar focusable elements. These are visible elements
+   * such as buttons or elements with tabindex.
+   */
+  get tabbarFocusableElms() {
+    return [...this.tabbar.querySelectorAll(
+      "[tabindex]:not([hidden]), button:not([hidden])")];
+  },
+
+  /**
+   * Reset tabindex attributes across all focusable elements inside the tabbar.
+   * Only have one element with tabindex=0 at a time to make sure that tabbing
+   * results in navigating away from the tabbar container.
+   * @param  {FocusEvent} event
+   */
+  _onTabbarFocus: function (event) {
+    this.tabbarFocusableElms.forEach(elm =>
+      elm.setAttribute("tabindex", event.target === elm ? "0" : "-1"));
+  },
+
+  /**
+   * On left/right arrow press, attempt to move the focus inside the tabbar to
+   * the previous/next focusable element.
+   * @param  {KeyboardEvent} event
+   */
+  _onTabbarArrowKeypress: function (event) {
+    let { key, target, ctrlKey, shiftKey, altKey, metaKey } = event;
+
+    // If any of the modifier keys are pressed do not attempt navigation as it
+    // might conflict with global shortcuts (Bug 1327972).
+    if (ctrlKey || shiftKey || altKey || metaKey) {
+      return;
+    }
+
+    let focusableElms = this.tabbarFocusableElms;
+    let curIndex = focusableElms.indexOf(target);
+
+    if (curIndex === -1) {
+      console.warn(target + " is not found among Developer Tools tab bar " +
+        "focusable elements. It needs to either be a button or have " +
+        "tabindex. If it is intended to be hidden, 'hidden' attribute must " +
+        "be used.");
+      return;
+    }
+
+    let newTarget;
+
+    if (key === "ArrowLeft") {
+      // Do nothing if already at the beginning.
+      if (curIndex === 0) {
+        return;
+      }
+      newTarget = focusableElms[curIndex - 1];
+    } else if (key === "ArrowRight") {
+      // Do nothing if already at the end.
+      if (curIndex === focusableElms.length - 1) {
+        return;
+      }
+      newTarget = focusableElms[curIndex + 1];
+    } else {
+      return;
+    }
+
+    focusableElms.forEach(elm =>
+      elm.setAttribute("tabindex", newTarget === elm ? "0" : "-1"));
+    newTarget.focus();
+
+    event.preventDefault();
+    event.stopPropagation();
+  },
+
+  /**
+   * Add buttons to the UI as specified in the devtools.toolbox.toolbarSpec pref
+   */
+  _buildButtons: function () {
+    if (this.target.getTrait("highlightable")) {
+      this._buildPickerButton();
+    }
+
+    this.setToolboxButtonsVisibility();
+
+    // Old servers don't have a GCLI Actor, so just return
+    if (!this.target.hasActor("gcli")) {
+      return promise.resolve();
+    }
+    // Disable gcli in browser toolbox until there is usages of it
+    if (this.target.chrome) {
+      return promise.resolve();
+    }
+
+    const options = {
+      environment: CommandUtils.createEnvironment(this, "_target")
+    };
+    return CommandUtils.createRequisition(this.target, options).then(requisition => {
+      this._requisition = requisition;
+
+      const spec = CommandUtils.getCommandbarSpec("devtools.toolbox.toolbarSpec");
+      return CommandUtils.createButtons(spec, this.target, this.doc, requisition)
+        .then(buttons => {
+          let container = this.doc.getElementById("toolbox-buttons");
+          buttons.forEach(button => {
+            if (button) {
+              container.appendChild(button);
+            }
+          });
+          this.setToolboxButtonsVisibility();
+        });
+    });
+  },
+
+  /**
+   * Adding the element picker button is done here unlike the other buttons
+   * since we want it to work for remote targets too
+   */
+  _buildPickerButton: function () {
+    this._pickerButton = this.doc.createElementNS(HTML_NS, "button");
+    this._pickerButton.id = "command-button-pick";
+    this._pickerButton.className =
+      "command-button command-button-invertable devtools-button";
+    this._pickerButton.setAttribute("title", L10N.getStr("pickButton.tooltip"));
+
+    let container = this.doc.querySelector("#toolbox-picker-container");
+    container.appendChild(this._pickerButton);
+
+    this._pickerButton.addEventListener("click", this._onPickerClick, false);
+  },
+
+  /**
+   * Toggle the picker, but also decide whether or not the highlighter should
+   * focus the window. This is only desirable when the toolbox is mounted to the
+   * window. When devtools is free floating, then the target window should not
+   * pop in front of the viewer when the picker is clicked.
+   */
+  _onPickerClick: function () {
+    let focus = this.hostType === Toolbox.HostType.BOTTOM ||
+                this.hostType === Toolbox.HostType.SIDE;
+    this.highlighterUtils.togglePicker(focus);
+  },
+
+  /**
+   * If the picker is activated, then allow the Escape key to deactivate the
+   * functionality instead of the default behavior of toggling the console.
+   */
+  _onPickerKeypress: function (event) {
+    if (event.keyCode === KeyCodes.DOM_VK_ESCAPE) {
+      this.highlighterUtils.cancelPicker();
+      // Stop the console from toggling.
+      event.stopImmediatePropagation();
+    }
+  },
+
+  _onPickerStarted: function () {
+    this.doc.addEventListener("keypress", this._onPickerKeypress, true);
+  },
+
+  _onPickerStopped: function () {
+    this.doc.removeEventListener("keypress", this._onPickerKeypress, true);
+  },
+
+  /**
+   * Apply the current cache setting from devtools.cache.disabled to this
+   * toolbox's tab.
+   */
+  _applyCacheSettings: function () {
+    let pref = "devtools.cache.disabled";
+    let cacheDisabled = Services.prefs.getBoolPref(pref);
+
+    if (this.target.activeTab) {
+      this.target.activeTab.reconfigure({"cacheDisabled": cacheDisabled});
+    }
+  },
+
+  /**
+   * Apply the current service workers testing setting from
+   * devtools.serviceWorkers.testing.enabled to this toolbox's tab.
+   */
+  _applyServiceWorkersTestingSettings: function () {
+    let pref = "devtools.serviceWorkers.testing.enabled";
+    let serviceWorkersTestingEnabled =
+      Services.prefs.getBoolPref(pref) || false;
+
+    if (this.target.activeTab) {
+      this.target.activeTab.reconfigure({
+        "serviceWorkersTestingEnabled": serviceWorkersTestingEnabled
+      });
+    }
+  },
+
+  /**
+   * Setter for the checked state of the picker button in the toolbar
+   * @param {Boolean} isChecked
+   */
+  set pickerButtonChecked(isChecked) {
+    if (isChecked) {
+      this._pickerButton.setAttribute("checked", "true");
+    } else {
+      this._pickerButton.removeAttribute("checked");
+    }
+  },
+
+  /**
+   * Return all toolbox buttons (command buttons, plus any others that were
+   * added manually).
+   */
+  get toolboxButtons() {
+    return ToolboxButtons.map(options => {
+      let button = this.doc.getElementById(options.id);
+      // Some buttons may not exist inside of Browser Toolbox
+      if (!button) {
+        return false;
+      }
+
+      return {
+        id: options.id,
+        button: button,
+        label: button.getAttribute("title"),
+        visibilityswitch: "devtools." + options.id + ".enabled",
+        isTargetSupported: options.isTargetSupported
+                           ? options.isTargetSupported
+                           : target => target.isLocalTab,
+      };
+    }).filter(button=>button);
+  },
+
+  /**
+   * Ensure the visibility of each toolbox button matches the
+   * preference value.  Simply hide buttons that are preffed off.
+   */
+  setToolboxButtonsVisibility: function () {
+    this.toolboxButtons.forEach(buttonSpec => {
+      let { visibilityswitch, button, isTargetSupported } = buttonSpec;
+      let on = true;
+      try {
+        on = Services.prefs.getBoolPref(visibilityswitch);
+      } catch (ex) {
+        // Do nothing.
+      }
+
+      on = on && isTargetSupported(this.target);
+
+      if (button) {
+        if (on) {
+          button.removeAttribute("hidden");
+        } else {
+          button.setAttribute("hidden", "true");
+        }
+      }
+    });
+
+    this._updateNoautohideButton();
+  },
+
+  /**
+   * Build a tab for one tool definition and add to the toolbox
+   *
+   * @param {string} toolDefinition
+   *        Tool definition of the tool to build a tab for.
+   */
+  _buildTabForTool: function (toolDefinition) {
+    if (!toolDefinition.isTargetSupported(this._target)) {
+      return;
+    }
+
+    let tabs = this.doc.getElementById("toolbox-tabs");
+    let deck = this.doc.getElementById("toolbox-deck");
+
+    let id = toolDefinition.id;
+
+    if (toolDefinition.ordinal == undefined || toolDefinition.ordinal < 0) {
+      toolDefinition.ordinal = MAX_ORDINAL;
+    }
+
+    let radio = this.doc.createElement("radio");
+    // The radio element is not being used in the conventional way, thus
+    // the devtools-tab class replaces the radio XBL binding with its base
+    // binding (the control-item binding).
+    radio.className = "devtools-tab";
+    radio.id = "toolbox-tab-" + id;
+    radio.setAttribute("toolid", id);
+    radio.setAttribute("tabindex", "0");
+    radio.setAttribute("ordinal", toolDefinition.ordinal);
+    radio.setAttribute("tooltiptext", toolDefinition.tooltip);
+    if (toolDefinition.invertIconForLightTheme) {
+      radio.setAttribute("icon-invertable", "light-theme");
+    } else if (toolDefinition.invertIconForDarkTheme) {
+      radio.setAttribute("icon-invertable", "dark-theme");
+    }
+
+    radio.addEventListener("command", this.selectTool.bind(this, id));
+
+    // spacer lets us center the image and label, while allowing cropping
+    let spacer = this.doc.createElement("spacer");
+    spacer.setAttribute("flex", "1");
+    radio.appendChild(spacer);
+
+    if (toolDefinition.icon) {
+      let image = this.doc.createElement("image");
+      image.className = "default-icon";
+      image.setAttribute("src",
+                         toolDefinition.icon || toolDefinition.highlightedicon);
+      radio.appendChild(image);
+      // Adding the highlighted icon image
+      image = this.doc.createElement("image");
+      image.className = "highlighted-icon";
+      image.setAttribute("src",
+                         toolDefinition.highlightedicon || toolDefinition.icon);
+      radio.appendChild(image);
+    }
+
+    if (toolDefinition.label && !toolDefinition.iconOnly) {
+      let label = this.doc.createElement("label");
+      label.setAttribute("value", toolDefinition.label);
+      label.setAttribute("crop", "end");
+      label.setAttribute("flex", "1");
+      radio.appendChild(label);
+    }
+
+    if (!toolDefinition.bgTheme) {
+      toolDefinition.bgTheme = "theme-toolbar";
+    }
+    let vbox = this.doc.createElement("vbox");
+    vbox.className = "toolbox-panel " + toolDefinition.bgTheme;
+
+    // There is already a container for the webconsole frame.
+    if (!this.doc.getElementById("toolbox-panel-" + id)) {
+      vbox.id = "toolbox-panel-" + id;
+    }
+
+    if (id === "options") {
+      // Options panel is special.  It doesn't belong in the same container as
+      // the other tabs.
+      radio.setAttribute("role", "button");
+      let optionTabContainer = this.doc.getElementById("toolbox-option-container");
+      optionTabContainer.appendChild(radio);
+      deck.appendChild(vbox);
+    } else {
+      radio.setAttribute("role", "tab");
+
+      // If there is no tab yet, or the ordinal to be added is the largest one.
+      if (tabs.childNodes.length == 0 ||
+          tabs.lastChild.getAttribute("ordinal") <= toolDefinition.ordinal) {
+        tabs.appendChild(radio);
+        deck.appendChild(vbox);
+      } else {
+        // else, iterate over all the tabs to get the correct location.
+        Array.some(tabs.childNodes, (node, i) => {
+          if (+node.getAttribute("ordinal") > toolDefinition.ordinal) {
+            tabs.insertBefore(radio, node);
+            deck.insertBefore(vbox, deck.childNodes[i]);
+            return true;
+          }
+          return false;
+        });
+      }
+    }
+
+    this._addKeysToWindow();
+  },
+
+  /**
+   * Ensure the tool with the given id is loaded.
+   *
+   * @param {string} id
+   *        The id of the tool to load.
+   */
+  loadTool: function (id) {
+    if (id === "inspector" && !this._inspector) {
+      return this.initInspector().then(() => {
+        return this.loadTool(id);
+      });
+    }
+
+    let deferred = defer();
+    let iframe = this.doc.getElementById("toolbox-panel-iframe-" + id);
+
+    if (iframe) {
+      let panel = this._toolPanels.get(id);
+      if (panel) {
+        deferred.resolve(panel);
+      } else {
+        this.once(id + "-ready", initializedPanel => {
+          deferred.resolve(initializedPanel);
+        });
+      }
+      return deferred.promise;
+    }
+
+    let definition = gDevTools.getToolDefinition(id);
+    if (!definition) {
+      deferred.reject(new Error("no such tool id " + id));
+      return deferred.promise;
+    }
+
+    iframe = this.doc.createElement("iframe");
+    iframe.className = "toolbox-panel-iframe";
+    iframe.id = "toolbox-panel-iframe-" + id;
+    iframe.setAttribute("flex", 1);
+    iframe.setAttribute("forceOwnRefreshDriver", "");
+    iframe.tooltip = "aHTMLTooltip";
+    iframe.style.visibility = "hidden";
+
+    gDevTools.emit(id + "-init", this, iframe);
+    this.emit(id + "-init", iframe);
+
+    // If no parent yet, append the frame into default location.
+    if (!iframe.parentNode) {
+      let vbox = this.doc.getElementById("toolbox-panel-" + id);
+      vbox.appendChild(iframe);
+    }
+
+    let onLoad = () => {
+      // Prevent flicker while loading by waiting to make visible until now.
+      iframe.style.visibility = "visible";
+
+      // Try to set the dir attribute as early as possible.
+      this.setIframeDocumentDir(iframe);
+
+      // The build method should return a panel instance, so events can
+      // be fired with the panel as an argument. However, in order to keep
+      // backward compatibility with existing extensions do a check
+      // for a promise return value.
+      let built = definition.build(iframe.contentWindow, this);
+
+      if (!(typeof built.then == "function")) {
+        let panel = built;
+        iframe.panel = panel;
+
+        // The panel instance is expected to fire (and listen to) various
+        // framework events, so make sure it's properly decorated with
+        // appropriate API (on, off, once, emit).
+        // In this case we decorate panel instances directly returned by
+        // the tool definition 'build' method.
+        if (typeof panel.emit == "undefined") {
+          EventEmitter.decorate(panel);
+        }
+
+        gDevTools.emit(id + "-build", this, panel);
+        this.emit(id + "-build", panel);
+
+        // The panel can implement an 'open' method for asynchronous
+        // initialization sequence.
+        if (typeof panel.open == "function") {
+          built = panel.open();
+        } else {
+          let buildDeferred = defer();
+          buildDeferred.resolve(panel);
+          built = buildDeferred.promise;
+        }
+      }
+
+      // Wait till the panel is fully ready and fire 'ready' events.
+      promise.resolve(built).then((panel) => {
+        this._toolPanels.set(id, panel);
+
+        // Make sure to decorate panel object with event API also in case
+        // where the tool definition 'build' method returns only a promise
+        // and the actual panel instance is available as soon as the
+        // promise is resolved.
+        if (typeof panel.emit == "undefined") {
+          EventEmitter.decorate(panel);
+        }
+
+        gDevTools.emit(id + "-ready", this, panel);
+        this.emit(id + "-ready", panel);
+
+        deferred.resolve(panel);
+      }, console.error);
+    };
+
+    iframe.setAttribute("src", definition.url);
+    if (definition.panelLabel) {
+      iframe.setAttribute("aria-label", definition.panelLabel);
+    }
+
+    // Depending on the host, iframe.contentWindow is not always
+    // defined at this moment. If it is not defined, we use an
+    // event listener on the iframe DOM node. If it's defined,
+    // we use the chromeEventHandler. We can't use a listener
+    // on the DOM node every time because this won't work
+    // if the (xul chrome) iframe is loaded in a content docshell.
+    if (iframe.contentWindow) {
+      let domHelper = new DOMHelpers(iframe.contentWindow);
+      domHelper.onceDOMReady(onLoad);
+    } else {
+      let callback = () => {
+        iframe.removeEventListener("DOMContentLoaded", callback);
+        onLoad();
+      };
+
+      iframe.addEventListener("DOMContentLoaded", callback);
+    }
+
+    return deferred.promise;
+  },
+
+  /**
+   * Set the dir attribute on the content document element of the provided iframe.
+   *
+   * @param {IFrameElement} iframe
+   */
+  setIframeDocumentDir: function (iframe) {
+    let docEl = iframe.contentWindow && iframe.contentWindow.document.documentElement;
+    if (!docEl || docEl.namespaceURI !== HTML_NS) {
+      // Bail out if the content window or document is not ready or if the document is not
+      // HTML.
+      return;
+    }
+
+    if (docEl.hasAttribute("dir")) {
+      // Set the dir attribute value only if dir is already present on the document.
+      let top = this.win.top;
+      let topDocEl = top.document.documentElement;
+      let isRtl = top.getComputedStyle(topDocEl).direction === "rtl";
+      docEl.setAttribute("dir", isRtl ? "rtl" : "ltr");
+    }
+  },
+
+  /**
+   * Mark all in collection as unselected; and id as selected
+   * @param {string} collection
+   *        DOM collection of items
+   * @param {string} id
+   *        The Id of the item within the collection to select
+   */
+  selectSingleNode: function (collection, id) {
+    [...collection].forEach(node => {
+      if (node.id === id) {
+        node.setAttribute("selected", "true");
+        node.setAttribute("aria-selected", "true");
+      } else {
+        node.removeAttribute("selected");
+        node.removeAttribute("aria-selected");
+      }
+    });
+  },
+
+  /**
+   * Switch to the tool with the given id
+   *
+   * @param {string} id
+   *        The id of the tool to switch to
+   */
+  selectTool: function (id) {
+    this.emit("before-select", id);
+
+    let tabs = this.doc.querySelectorAll(".devtools-tab");
+    this.selectSingleNode(tabs, "toolbox-tab-" + id);
+
+    // If options is selected, the separator between it and the
+    // command buttons should be hidden.
+    let sep = this.doc.getElementById("toolbox-controls-separator");
+    if (id === "options") {
+      sep.setAttribute("invisible", "true");
+    } else {
+      sep.removeAttribute("invisible");
+    }
+
+    if (this.currentToolId == id) {
+      let panel = this._toolPanels.get(id);
+      if (panel) {
+        // We have a panel instance, so the tool is already fully loaded.
+
+        // re-focus tool to get key events again
+        this.focusTool(id);
+
+        // Return the existing panel in order to have a consistent return value.
+        return promise.resolve(panel);
+      }
+      // Otherwise, if there is no panel instance, it is still loading,
+      // so we are racing another call to selectTool with the same id.
+      return this.once("select").then(() => promise.resolve(this._toolPanels.get(id)));
+    }
+
+    if (!this.isReady) {
+      throw new Error("Can't select tool, wait for toolbox 'ready' event");
+    }
+
+    let tab = this.doc.getElementById("toolbox-tab-" + id);
+
+    if (tab) {
+      if (this.currentToolId) {
+        this._telemetry.toolClosed(this.currentToolId);
+      }
+      this._telemetry.toolOpened(id);
+    } else {
+      throw new Error("No tool found");
+    }
+
+    let tabstrip = this.doc.getElementById("toolbox-tabs");
+
+    // select the right tab, making 0th index the default tab if right tab not
+    // found.
+    tabstrip.selectedItem = tab || tabstrip.childNodes[0];
+
+    // and select the right iframe
+    let toolboxPanels = this.doc.querySelectorAll(".toolbox-panel");
+    this.selectSingleNode(toolboxPanels, "toolbox-panel-" + id);
+
+    this.lastUsedToolId = this.currentToolId;
+    this.currentToolId = id;
+    this._refreshConsoleDisplay();
+    if (id != "options") {
+      Services.prefs.setCharPref(this._prefs.LAST_TOOL, id);
+    }
+
+    return this.loadTool(id).then(panel => {
+      // focus the tool's frame to start receiving key events
+      this.focusTool(id);
+
+      this.emit("select", id);
+      this.emit(id + "-selected", panel);
+      return panel;
+    });
+  },
+
+  /**
+   * Focus a tool's panel by id
+   * @param  {string} id
+   *         The id of tool to focus
+   */
+  focusTool: function (id, state = true) {
+    let iframe = this.doc.getElementById("toolbox-panel-iframe-" + id);
+
+    if (state) {
+      iframe.focus();
+    } else {
+      iframe.blur();
+    }
+  },
+
+  /**
+   * Focus split console's input line
+   */
+  focusConsoleInput: function () {
+    let consolePanel = this.getPanel("webconsole");
+    if (consolePanel) {
+      consolePanel.focusInput();
+    }
+  },
+
+  /**
+   * If the console is split and we are focusing an element outside
+   * of the console, then store the newly focused element, so that
+   * it can be restored once the split console closes.
+   */
+  _onFocus: function ({originalTarget}) {
+    // Ignore any non element nodes, or any elements contained
+    // within the webconsole frame.
+    let webconsoleURL = gDevTools.getToolDefinition("webconsole").url;
+    if (originalTarget.nodeType !== 1 ||
+        originalTarget.baseURI === webconsoleURL) {
+      return;
+    }
+
+    this._lastFocusedElement = originalTarget;
+  },
+
+  /**
+   * Opens the split console.
+   *
+   * @returns {Promise} a promise that resolves once the tool has been
+   *          loaded and focused.
+   */
+  openSplitConsole: function () {
+    this._splitConsole = true;
+    Services.prefs.setBoolPref(SPLITCONSOLE_ENABLED_PREF, true);
+    this._refreshConsoleDisplay();
+    this.emit("split-console");
+
+    return this.loadTool("webconsole").then(() => {
+      this.focusConsoleInput();
+    });
+  },
+
+  /**
+   * Closes the split console.
+   *
+   * @returns {Promise} a promise that resolves once the tool has been
+   *          closed.
+   */
+  closeSplitConsole: function () {
+    this._splitConsole = false;
+    Services.prefs.setBoolPref(SPLITCONSOLE_ENABLED_PREF, false);
+    this._refreshConsoleDisplay();
+    this.emit("split-console");
+
+    if (this._lastFocusedElement) {
+      this._lastFocusedElement.focus();
+    }
+    return promise.resolve();
+  },
+
+  /**
+   * Toggles the split state of the webconsole.  If the webconsole panel
+   * is already selected then this command is ignored.
+   *
+   * @returns {Promise} a promise that resolves once the tool has been
+   *          opened or closed.
+   */
+  toggleSplitConsole: function () {
+    if (this.currentToolId !== "webconsole") {
+      return this.splitConsole ?
+             this.closeSplitConsole() :
+             this.openSplitConsole();
+    }
+
+    return promise.resolve();
+  },
+
+  /**
+   * Tells the target tab to reload.
+   */
+  reloadTarget: function (force) {
+    this.target.activeTab.reload({ force: force });
+  },
+
+  /**
+   * Loads the tool next to the currently selected tool.
+   */
+  selectNextTool: function () {
+    let tools = this.doc.querySelectorAll(".devtools-tab");
+    let selected = this.doc.querySelector(".devtools-tab[selected]");
+    let nextIndex = [...tools].indexOf(selected) + 1;
+    let next = tools[nextIndex] || tools[0];
+    let tool = next.getAttribute("toolid");
+    return this.selectTool(tool);
+  },
+
+  /**
+   * Loads the tool just left to the currently selected tool.
+   */
+  selectPreviousTool: function () {
+    let tools = this.doc.querySelectorAll(".devtools-tab");
+    let selected = this.doc.querySelector(".devtools-tab[selected]");
+    let prevIndex = [...tools].indexOf(selected) - 1;
+    let prev = tools[prevIndex] || tools[tools.length - 1];
+    let tool = prev.getAttribute("toolid");
+    return this.selectTool(tool);
+  },
+
+  /**
+   * Highlights the tool's tab if it is not the currently selected tool.
+   *
+   * @param {string} id
+   *        The id of the tool to highlight
+   */
+  highlightTool: function (id) {
+    let tab = this.doc.getElementById("toolbox-tab-" + id);
+    tab && tab.setAttribute("highlighted", "true");
+  },
+
+  /**
+   * De-highlights the tool's tab.
+   *
+   * @param {string} id
+   *        The id of the tool to unhighlight
+   */
+  unhighlightTool: function (id) {
+    let tab = this.doc.getElementById("toolbox-tab-" + id);
+    tab && tab.removeAttribute("highlighted");
+  },
+
+  /**
+   * Raise the toolbox host.
+   */
+  raise: function () {
+    this.postMessage({
+      name: "raise-host"
+    });
+  },
+
+  /**
+   * Refresh the host's title.
+   */
+  _refreshHostTitle: function () {
+    let title;
+    if (this.target.name && this.target.name != this.target.url) {
+      title = L10N.getFormatStr("toolbox.titleTemplate2", this.target.name,
+                                                          this.target.url);
+    } else {
+      title = L10N.getFormatStr("toolbox.titleTemplate1", this.target.url);
+    }
+    this.postMessage({
+      name: "set-host-title",
+      title
+    });
+  },
+
+  // Returns an instance of the preference actor
+  get _preferenceFront() {
+    return this.target.root.then(rootForm => {
+      return getPreferenceFront(this.target.client, rootForm);
+    });
+  },
+
+  _toggleAutohide: Task.async(function* () {
+    let prefName = "ui.popup.disable_autohide";
+    let front = yield this._preferenceFront;
+    let current = yield front.getBoolPref(prefName);
+    yield front.setBoolPref(prefName, !current);
+
+    this._updateNoautohideButton();
+  }),
+
+  _updateNoautohideButton: Task.async(function* () {
+    let menu = this.doc.getElementById("command-button-noautohide");
+    if (menu.getAttribute("hidden") === "true") {
+      return;
+    }
+    if (!this.target.root) {
+      return;
+    }
+    let prefName = "ui.popup.disable_autohide";
+    let front = yield this._preferenceFront;
+    let current = yield front.getBoolPref(prefName);
+    if (current) {
+      menu.setAttribute("checked", "true");
+    } else {
+      menu.removeAttribute("checked");
+    }
+  }),
+
+  _listFrames: function (event) {
+    if (!this._target.activeTab || !this._target.activeTab.traits.frames) {
+      // We are not targetting a regular TabActor
+      // it can be either an addon or browser toolbox actor
+      return promise.resolve();
+    }
+    let packet = {
+      to: this._target.form.actor,
+      type: "listFrames"
+    };
+    return this._target.client.request(packet, resp => {
+      this._updateFrames(null, { frames: resp.frames });
+    });
+  },
+
+  /**
+   * Show a drop down menu that allows the user to switch frames.
+   */
+  showFramesMenu: function (event) {
+    let menu = new Menu();
+    let target = event.target;
+
+    // Generate list of menu items from the list of frames.
+    this.frameMap.forEach(frame => {
+      // A frame is checked if it's the selected one.
+      let checked = frame.id == this.selectedFrameId;
+
+      // Create menu item.
+      menu.append(new MenuItem({
+        label: frame.url,
+        type: "radio",
+        checked,
+        click: () => {
+          this.onSelectFrame(frame.id);
+        }
+      }));
+    });
+
+    menu.once("open").then(() => {
+      target.setAttribute("open", "true");
+    });
+
+    menu.once("close").then(() => {
+      target.removeAttribute("open");
+    });
+
+    // Show a drop down menu with frames.
+    // XXX Missing menu API for specifying target (anchor)
+    // and relative position to it. See also:
+    // https://developer.mozilla.org/en-US/docs/Mozilla/Tech/XUL/Method/openPopup
+    // https://bugzilla.mozilla.org/show_bug.cgi?id=1274551
+    let rect = target.getBoundingClientRect();
+    let screenX = target.ownerDocument.defaultView.mozInnerScreenX;
+    let screenY = target.ownerDocument.defaultView.mozInnerScreenY;
+    menu.popup(rect.left + screenX, rect.bottom + screenY, this);
+
+    return menu;
+  },
+
+  /**
+   * Select a frame by sending 'switchToFrame' packet to the backend.
+   */
+  onSelectFrame: function (frameId) {
+    // Send packet to the backend to select specified frame and
+    // wait for 'frameUpdate' event packet to update the UI.
+    let packet = {
+      to: this._target.form.actor,
+      type: "switchToFrame",
+      windowId: frameId
+    };
+    this._target.client.request(packet);
+  },
+
+  /**
+   * A handler for 'frameUpdate' packets received from the backend.
+   * Following properties might be set on the packet:
+   *
+   * destroyAll {Boolean}: All frames have been destroyed.
+   * selected {Number}: A frame has been selected
+   * frames {Array}: list of frames. Every frame can have:
+   *                 id {Number}: frame ID
+   *                 url {String}: frame URL
+   *                 title {String}: frame title
+   *                 destroy {Boolean}: Set to true if destroyed
+   *                 parentID {Number}: ID of the parent frame (not set
+   *                                    for top level window)
+   */
+  _updateFrames: function (event, data) {
+    if (!Services.prefs.getBoolPref("devtools.command-button-frames.enabled")) {
+      return;
+    }
+
+    // We may receive this event before the toolbox is ready.
+    if (!this.isReady) {
+      return;
+    }
+
+    // Store (synchronize) data about all existing frames on the backend
+    if (data.destroyAll) {
+      this.frameMap.clear();
+      this.selectedFrameId = null;
+    } else if (data.selected) {
+      this.selectedFrameId = data.selected;
+    } else if (data.frames) {
+      data.frames.forEach(frame => {
+        if (frame.destroy) {
+          this.frameMap.delete(frame.id);
+
+          // Reset the currently selected frame if it's destroyed.
+          if (this.selectedFrameId == frame.id) {
+            this.selectedFrameId = null;
+          }
+        } else {
+          this.frameMap.set(frame.id, frame);
+        }
+      });
+    }
+
+    // If there is no selected frame select the first top level
+    // frame by default. Note that there might be more top level
+    // frames in case of the BrowserToolbox.
+    if (!this.selectedFrameId) {
+      let frames = [...this.frameMap.values()];
+      let topFrames = frames.filter(frame => !frame.parentID);
+      this.selectedFrameId = topFrames.length ? topFrames[0].id : null;
+    }
+
+    // Check out whether top frame is currently selected.
+    // Note that only child frame has parentID.
+    let frame = this.frameMap.get(this.selectedFrameId);
+    let topFrameSelected = frame ? !frame.parentID : false;
+    let button = this.doc.getElementById("command-button-frames");
+    button.removeAttribute("checked");
+
+    // If non-top level frame is selected the toolbar button is
+    // marked as 'checked' indicating that a child frame is active.
+    if (!topFrameSelected && this.selectedFrameId) {
+      button.setAttribute("checked", "true");
+    }
+  },
+
+  /**
+   * Switch to the last used host for the toolbox UI.
+   */
+  switchToPreviousHost: function () {
+    return this.switchHost("previous");
+  },
+
+  /**
+   * Switch to a new host for the toolbox UI. E.g. bottom, sidebar, window,
+   * and focus the window when done.
+   *
+   * @param {string} hostType
+   *        The host type of the new host object
+   */
+  switchHost: function (hostType) {
+    if (hostType == this.hostType || !this._target.isLocalTab) {
+      return null;
+    }
+
+    this.emit("host-will-change", hostType);
+
+    // ToolboxHostManager is going to call swapFrameLoaders which mess up with
+    // focus. We have to blur before calling it in order to be able to restore
+    // the focus after, in _onSwitchedHost.
+    this.focusTool(this.currentToolId, false);
+
+    // Host code on the chrome side will send back a message once the host
+    // switched
+    this.postMessage({
+      name: "switch-host",
+      hostType
+    });
+
+    return this.once("host-changed");
+  },
+
+  _onSwitchedHost: function ({ hostType }) {
+    this._hostType = hostType;
+
+    this._buildDockButtons();
+    this._addKeysToWindow();
+
+    // We blurred the tools at start of switchHost, but also when clicking on
+    // host switching button. We now have to restore the focus.
+    this.focusTool(this.currentToolId, true);
+
+    this.emit("host-changed");
+    this._telemetry.log(HOST_HISTOGRAM, this._getTelemetryHostId());
+  },
+
+  /**
+   * Return if the tool is available as a tab (i.e. if it's checked
+   * in the options panel). This is different from Toolbox.getPanel -
+   * a tool could be registered but not yet opened in which case
+   * isToolRegistered would return true but getPanel would return false.
+   */
+  isToolRegistered: function (toolId) {
+    return gDevTools.getToolDefinitionMap().has(toolId);
+  },
+
+  /**
+   * Handler for the tool-registered event.
+   * @param  {string} event
+   *         Name of the event ("tool-registered")
+   * @param  {string} toolId
+   *         Id of the tool that was registered
+   */
+  _toolRegistered: function (event, toolId) {
+    let tool = gDevTools.getToolDefinition(toolId);
+    this._buildTabForTool(tool);
+    // Emit the event so tools can listen to it from the toolbox level
+    // instead of gDevTools
+    this.emit("tool-registered", toolId);
+  },
+
+  /**
+   * Handler for the tool-unregistered event.
+   * @param  {string} event
+   *         Name of the event ("tool-unregistered")
+   * @param  {string|object} toolId
+   *         Definition or id of the tool that was unregistered. Passing the
+   *         tool id should be avoided as it is a temporary measure.
+   */
+  _toolUnregistered: function (event, toolId) {
+    if (typeof toolId != "string") {
+      toolId = toolId.id;
+    }
+
+    if (this._toolPanels.has(toolId)) {
+      let instance = this._toolPanels.get(toolId);
+      instance.destroy();
+      this._toolPanels.delete(toolId);
+    }
+
+    let radio = this.doc.getElementById("toolbox-tab-" + toolId);
+    let panel = this.doc.getElementById("toolbox-panel-" + toolId);
+
+    if (radio) {
+      if (this.currentToolId == toolId) {
+        let nextToolName = null;
+        if (radio.nextSibling) {
+          nextToolName = radio.nextSibling.getAttribute("toolid");
+        }
+        if (radio.previousSibling) {
+          nextToolName = radio.previousSibling.getAttribute("toolid");
+        }
+        if (nextToolName) {
+          this.selectTool(nextToolName);
+        }
+      }
+      radio.parentNode.removeChild(radio);
+    }
+
+    if (panel) {
+      panel.parentNode.removeChild(panel);
+    }
+
+    if (this.hostType == Toolbox.HostType.WINDOW) {
+      let doc = this.win.parent.document;
+      let key = doc.getElementById("key_" + toolId);
+      if (key) {
+        key.parentNode.removeChild(key);
+      }
+    }
+    // Emit the event so tools can listen to it from the toolbox level
+    // instead of gDevTools
+    this.emit("tool-unregistered", toolId);
+  },
+
+  /**
+   * Initialize the inspector/walker/selection/highlighter fronts.
+   * Returns a promise that resolves when the fronts are initialized
+   */
+  initInspector: function () {
+    if (!this._initInspector) {
+      this._initInspector = Task.spawn(function* () {
+        this._inspector = InspectorFront(this._target.client, this._target.form);
+        let pref = "devtools.inspector.showAllAnonymousContent";
+        let showAllAnonymousContent = Services.prefs.getBoolPref(pref);
+        this._walker = yield this._inspector.getWalker({ showAllAnonymousContent });
+        this._selection = new Selection(this._walker);
+
+        if (this.highlighterUtils.isRemoteHighlightable()) {
+          this.walker.on("highlighter-ready", this._highlighterReady);
+          this.walker.on("highlighter-hide", this._highlighterHidden);
+
+          let autohide = !flags.testing;
+          this._highlighter = yield this._inspector.getHighlighter(autohide);
+        }
+      }.bind(this));
+    }
+    return this._initInspector;
+  },
+
+  /**
+   * Destroy the inspector/walker/selection fronts
+   * Returns a promise that resolves when the fronts are destroyed
+   */
+  destroyInspector: function () {
+    if (this._destroyingInspector) {
+      return this._destroyingInspector;
+    }
+
+    this._destroyingInspector = Task.spawn(function* () {
+      if (!this._inspector) {
+        return;
+      }
+
+      // Releasing the walker (if it has been created)
+      // This can fail, but in any case, we want to continue destroying the
+      // inspector/highlighter/selection
+      // FF42+: Inspector actor starts managing Walker actor and auto destroy it.
+      if (this._walker && !this.walker.traits.autoReleased) {
+        try {
+          yield this._walker.release();
+        } catch (e) {
+          // Do nothing;
+        }
+      }
+
+      yield this.highlighterUtils.stopPicker();
+      yield this._inspector.destroy();
+      if (this._highlighter) {
+        // Note that if the toolbox is closed, this will work fine, but will fail
+        // in case the browser is closed and will trigger a noSuchActor message.
+        // We ignore the promise that |_hideBoxModel| returns, since we should still
+        // proceed with the rest of destruction if it fails.
+        // FF42+ now does the cleanup from the actor.
+        if (!this.highlighter.traits.autoHideOnDestroy) {
+          this.highlighterUtils.unhighlight();
+        }
+        yield this._highlighter.destroy();
+      }
+      if (this._selection) {
+        this._selection.destroy();
+      }
+
+      if (this.walker) {
+        this.walker.off("highlighter-ready", this._highlighterReady);
+        this.walker.off("highlighter-hide", this._highlighterHidden);
+      }
+
+      this._inspector = null;
+      this._highlighter = null;
+      this._selection = null;
+      this._walker = null;
+    }.bind(this));
+    return this._destroyingInspector;
+  },
+
+  /**
+   * Get the toolbox's notification component
+   *
+   * @return The notification box component.
+   */
+  getNotificationBox: function () {
+    return this.notificationBox;
+  },
+
+  /**
+   * Remove all UI elements, detach from target and clear up
+   */
+  destroy: function () {
+    // If several things call destroy then we give them all the same
+    // destruction promise so we're sure to destroy only once
+    if (this._destroyer) {
+      return this._destroyer;
+    }
+    let deferred = defer();
+    this._destroyer = deferred.promise;
+
+    this.emit("destroy");
+
+    this._target.off("navigate", this._refreshHostTitle);
+    this._target.off("frame-update", this._updateFrames);
+    this.off("select", this._refreshHostTitle);
+    this.off("host-changed", this._refreshHostTitle);
+    this.off("ready", this._showDevEditionPromo);
+
+    gDevTools.off("tool-registered", this._toolRegistered);
+    gDevTools.off("tool-unregistered", this._toolUnregistered);
+
+    gDevTools.off("pref-changed", this._prefChanged);
+
+    this._lastFocusedElement = null;
+    if (this._sourceMapService) {
+      this._sourceMapService.destroy();
+      this._sourceMapService = null;
+    }
+
+    if (this.webconsolePanel) {
+      this._saveSplitConsoleHeight();
+      this.webconsolePanel.removeEventListener("resize",
+        this._saveSplitConsoleHeight);
+      this.webconsolePanel = null;
+    }
+    if (this.closeButton) {
+      this.closeButton.removeEventListener("click", this.destroy, true);
+      this.closeButton = null;
+    }
+    if (this.textBoxContextMenuPopup) {
+      this.textBoxContextMenuPopup.removeEventListener("popupshowing",
+        this._updateTextBoxMenuItems, true);
+      this.textBoxContextMenuPopup = null;
+    }
+    if (this.tabbar) {
+      this.tabbar.removeEventListener("focus", this._onTabbarFocus, true);
+      this.tabbar.removeEventListener("click", this._onTabbarFocus, true);
+      this.tabbar.removeEventListener("keypress", this._onTabbarArrowKeypress);
+      this.tabbar = null;
+    }
+
+    let outstanding = [];
+    for (let [id, panel] of this._toolPanels) {
+      try {
+        gDevTools.emit(id + "-destroy", this, panel);
+        this.emit(id + "-destroy", panel);
+
+        outstanding.push(panel.destroy());
+      } catch (e) {
+        // We don't want to stop here if any panel fail to close.
+        console.error("Panel " + id + ":", e);
+      }
+    }
+
+    this.browserRequire = null;
+
+    // Now that we are closing the toolbox we can re-enable the cache settings
+    // and disable the service workers testing settings for the current tab.
+    // FF41+ automatically cleans up state in actor on disconnect.
+    if (this.target.activeTab && !this.target.activeTab.traits.noTabReconfigureOnClose) {
+      this.target.activeTab.reconfigure({
+        "cacheDisabled": false,
+        "serviceWorkersTestingEnabled": false
+      });
+    }
+
+    // Destroying the walker and inspector fronts
+    outstanding.push(this.destroyInspector().then(() => {
+      // Removing buttons
+      if (this._pickerButton) {
+        this._pickerButton.removeEventListener("click", this._togglePicker, false);
+        this._pickerButton = null;
+      }
+    }));
+
+    // Destroy the profiler connection
+    outstanding.push(this.destroyPerformance());
+
+    // Detach the thread
+    detachThread(this._threadClient);
+    this._threadClient = null;
+
+    // We need to grab a reference to win before this._host is destroyed.
+    let win = this.win;
+
+    if (this._requisition) {
+      CommandUtils.destroyRequisition(this._requisition, this.target);
+    }
+    this._telemetry.toolClosed("toolbox");
+    this._telemetry.destroy();
+
+    // Finish all outstanding tasks (which means finish destroying panels and
+    // then destroying the host, successfully or not) before destroying the
+    // target.
+    deferred.resolve(settleAll(outstanding)
+        .catch(console.error)
+        .then(() => {
+          this._removeHostListeners();
+
+          // `location` may already be null if the toolbox document is already
+          // in process of destruction. Otherwise if it is still around, ensure
+          // releasing toolbox document and triggering cleanup thanks to unload
+          // event. We do that precisely here, before nullifying the target as
+          // various cleanup code depends on the target attribute to be still
+          // defined.
+          if (win.location) {
+            win.location.replace("about:blank");
+          }
+
+          // Targets need to be notified that the toolbox is being torn down.
+          // This is done after other destruction tasks since it may tear down
+          // fronts and the debugger transport which earlier destroy methods may
+          // require to complete.
+          if (!this._target) {
+            return null;
+          }
+          let target = this._target;
+          this._target = null;
+          this.highlighterUtils.release();
+          target.off("close", this.destroy);
+          return target.destroy();
+        }, console.error).then(() => {
+          this.emit("destroyed");
+
+          // Free _host after the call to destroyed in order to let a chance
+          // to destroyed listeners to still query toolbox attributes
+          this._host = null;
+          this._win = null;
+          this._toolPanels.clear();
+
+          // Force GC to prevent long GC pauses when running tests and to free up
+          // memory in general when the toolbox is closed.
+          if (flags.testing) {
+            win.QueryInterface(Ci.nsIInterfaceRequestor)
+              .getInterface(Ci.nsIDOMWindowUtils)
+              .garbageCollect();
+          }
+        }).then(null, console.error));
+
+    let leakCheckObserver = ({wrappedJSObject: barrier}) => {
+      // Make the leak detector wait until this toolbox is properly destroyed.
+      barrier.client.addBlocker("DevTools: Wait until toolbox is destroyed",
+                                this._destroyer);
+    };
+
+    let topic = "shutdown-leaks-before-check";
+    Services.obs.addObserver(leakCheckObserver, topic, false);
+    this._destroyer.then(() => {
+      Services.obs.removeObserver(leakCheckObserver, topic);
+    });
+
+    return this._destroyer;
+  },
+
+  _highlighterReady: function () {
+    this.emit("highlighter-ready");
+  },
+
+  _highlighterHidden: function () {
+    this.emit("highlighter-hide");
+  },
+
+  /**
+   * For displaying the promotional Doorhanger on first opening of
+   * the developer tools, promoting the Developer Edition.
+   */
+  _showDevEditionPromo: function () {
+    // Do not display in browser toolbox
+    if (this.target.chrome) {
+      return;
+    }
+    showDoorhanger({ window: this.win, type: "deveditionpromo" });
+  },
+
+  /**
+   * Enable / disable necessary textbox menu items using globalOverlay.js.
+   */
+  _updateTextBoxMenuItems: function () {
+    let window = this.win;
+    ["cmd_undo", "cmd_delete", "cmd_cut",
+     "cmd_copy", "cmd_paste", "cmd_selectAll"].forEach(window.goUpdateCommand);
+  },
+
+  /**
+   * Open the textbox context menu at given coordinates.
+   * Panels in the toolbox can call this on contextmenu events with event.screenX/Y
+   * instead of having to implement their own copy/paste/selectAll menu.
+   * @param {Number} x
+   * @param {Number} y
+   */
+  openTextBoxContextMenu: function (x, y) {
+    this.textBoxContextMenuPopup.openPopupAtScreen(x, y, true);
+  },
+
+  /**
+   * Connects to the SPS profiler when the developer tools are open. This is
+   * necessary because of the WebConsole's `profile` and `profileEnd` methods.
+   */
+  initPerformance: Task.async(function* () {
+    // If target does not have profiler actor (addons), do not
+    // even register the shared performance connection.
+    if (!this.target.hasActor("profiler")) {
+      return promise.resolve();
+    }
+
+    if (this._performanceFrontConnection) {
+      return this._performanceFrontConnection.promise;
+    }
+
+    this._performanceFrontConnection = defer();
+    this._performance = createPerformanceFront(this._target);
+    yield this.performance.connect();
+
+    // Emit an event when connected, but don't wait on startup for this.
+    this.emit("profiler-connected");
+
+    this.performance.on("*", this._onPerformanceFrontEvent);
+    this._performanceFrontConnection.resolve(this.performance);
+    return this._performanceFrontConnection.promise;
+  }),
+
+  /**
+   * Disconnects the underlying Performance actor. If the connection
+   * has not finished initializing, as opening a toolbox does not wait,
+   * the performance connection destroy method will wait for it on its own.
+   */
+  destroyPerformance: Task.async(function* () {
+    if (!this.performance) {
+      return;
+    }
+    // If still connecting to performance actor, allow the
+    // actor to resolve its connection before attempting to destroy.
+    if (this._performanceFrontConnection) {
+      yield this._performanceFrontConnection.promise;
+    }
+    this.performance.off("*", this._onPerformanceFrontEvent);
+    yield this.performance.destroy();
+    this._performance = null;
+  }),
+
+  /**
+   * Called when any event comes from the PerformanceFront. If the performance tool is
+   * already loaded when the first event comes in, immediately unbind this handler, as
+   * this is only used to queue up observed recordings before the performance tool can
+   * handle them, which will only occur when `console.profile()` recordings are started
+   * before the tool loads.
+   */
+  _onPerformanceFrontEvent: Task.async(function* (eventName, recording) {
+    if (this.getPanel("performance")) {
+      this.performance.off("*", this._onPerformanceFrontEvent);
+      return;
+    }
+
+    this._performanceQueuedRecordings = this._performanceQueuedRecordings || [];
+    let recordings = this._performanceQueuedRecordings;
+
+    // Before any console recordings, we'll get a `console-profile-start` event
+    // warning us that a recording will come later (via `recording-started`), so
+    // start to boot up the tool and populate the tool with any other recordings
+    // observed during that time.
+    if (eventName === "console-profile-start" && !this._performanceToolOpenedViaConsole) {
+      this._performanceToolOpenedViaConsole = this.loadTool("performance");
+      let panel = yield this._performanceToolOpenedViaConsole;
+      yield panel.open();
+
+      panel.panelWin.PerformanceController.populateWithRecordings(recordings);
+      this.performance.off("*", this._onPerformanceFrontEvent);
+    }
+
+    // Otherwise, if it's a recording-started event, we've already started loading
+    // the tool, so just store this recording in our array to be later populated
+    // once the tool loads.
+    if (eventName === "recording-started") {
+      recordings.push(recording);
+    }
+  }),
+
+  /**
+   * Returns gViewSourceUtils for viewing source.
+   */
+  get gViewSourceUtils() {
+    return this.win.gViewSourceUtils;
+  },
+
+  /**
+   * Opens source in style editor. Falls back to plain "view-source:".
+   * @see devtools/client/shared/source-utils.js
+   */
+  viewSourceInStyleEditor: function (sourceURL, sourceLine) {
+    return viewSource.viewSourceInStyleEditor(this, sourceURL, sourceLine);
+  },
+
+  /**
+   * Opens source in debugger. Falls back to plain "view-source:".
+   * @see devtools/client/shared/source-utils.js
+   */
+  viewSourceInDebugger: function (sourceURL, sourceLine) {
+    return viewSource.viewSourceInDebugger(this, sourceURL, sourceLine);
+  },
+
+  /**
+   * Opens source in scratchpad. Falls back to plain "view-source:".
+   * TODO The `sourceURL` for scratchpad instances are like `Scratchpad/1`.
+   * If instances are scoped one-per-browser-window, then we should be able
+   * to infer the URL from this toolbox, or use the built in scratchpad IN
+   * the toolbox.
+   *
+   * @see devtools/client/shared/source-utils.js
+   */
+  viewSourceInScratchpad: function (sourceURL, sourceLine) {
+    return viewSource.viewSourceInScratchpad(sourceURL, sourceLine);
+  },
+
+  /**
+   * Opens source in plain "view-source:".
+   * @see devtools/client/shared/source-utils.js
+   */
+  viewSource: function (sourceURL, sourceLine) {
+    return viewSource.viewSource(this, sourceURL, sourceLine);
+  },
+};